It's possible that the issue is with your support settings in Chitubox. Try increasing the support density and decreasing the size of the supports, especially around the areas where your parts are breaking. Ensure that the supports are being generated in red areas where necessary. If the issue persists, you can also try adjusting the slicing parameters in Chitubox to see if that helps. Another possible issue is with the resin. Try a different brand you can check here https://43dprint.org/filament-for-ender-3/ or type of resin and see if that resolves the problem. Additionally, make sure that your build platform is level and your resin vat is clean to minimize any adhesion issues.